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Dissertation
Discovering Knowledge in Bipartite Graphs with Formal Concept Analysis
(2019)
Since the 1970s knowledge based approaches are a crucial part of artificial intelligence (AI) research. In this work we investigate data sets in the form of bipartite graphs, i.e., graphs where a bipartition of the vertex set respecting the edge set can be found, for knowledge. To this end we first relate those bipartite graphs to the structure formal context, as used in formal concept analysis (FCA). This link enables us to employ the whole tool-set of FCA to bipartite graphs and therefore, notably, to bipartite ...
Konferenzveröffentlichung
Designing a Conversational Agent as a Formative Course Evaluation Tool
(GITO Verlag, 2020)
Today’s graduating students face ever-changing environments when they enter their job life. Educational institutions must therefore continuously develop their course structure and content in order to prepare their students to be future employees. A very important means for developing the courses is the students’ course evaluations. Due to financial and organizational restrictions, these course evaluations are usually carried out quantitatively and at the end of the semester. However, past research has shown that this ...
Dissertation
Beitrag zur Betrachtung des Einflusses der Anforderungen auf die Hazard-Rate unter besonderer Berücksichtigung des Zusammenhangs zwischen Anforderungsrate, Ausfallrate, Probability of Dangerous Failure on Demand, Probability of Dangerous Failure per Hour und Hazard-Rate
(2015)
Durch die Digitalisierung verstärkt sich der Einsatz von komplexen elektronischen Systemen. Diese Systeme müssen sowohl gesetzlich und normativ geforderte Sicherheitsaspekte erfüllen als auch betriebswirtschaftlich ihre Rendite durch Verfügbarkeit erzielen. Einhergehend mit der Komplexität steigen die Anforderungen an Zuverlässigkeit, Sicherheit und Verfügbarkeit für das Gesamtsystem bestehend aus dem zu überwachenden System und dem Sicherheitssystem.
In dieser Monographie werden Erweiterungen von existierenden ...
Habilitation
Applicability of ordinal-array-based indicators to strange nonchaotic attractors
(Universität Kassel, 2017-06-12)
Time series are useful for modeling systems behavior, for predicting some events (catastrophes, epidemics, weather, ...) or for classification purposes (pattern recognition, pattern analysis). Among the existing data analysis algorithms, ordinal pattern based algorithms have been shown effective when dealing with simulation data. However, when applied to quasi-periodically forced systems, they fail to detect SNA and tori as regular dynamics. In this work we address this concern by defining ordinal array (OA) based ...
Aufsatz
A unified and memory efficient framework for simulating mechanical behavior of carbon nanotubes
(2015-06-01)
Carbon nanotubes possess many interesting properties, which make them a promising material for a variety of applications. In this paper, we present a unified framework for the simulation of the mechanical behavior of carbon nanotubes. It allows the creation, simulation and visualization of these structures, extending previous work by the research group “MISMO” at TU Darmstadt. In particular, we develop and integrate a new matrix-free iterative solving procedure, employing the conjugate gradient method, that drastically ...
Konferenzveröffentlichung
A Conversational Agent to Improve Response Quality in Course Evaluations
(Association for Computing Machinery, 2020)
Recent advances in Natural Language Processing (NLP) bear the opportunity to design new forms of human-computer interaction with conversational interfaces. We hypothesize that these interfaces can interactively engage students to increase response quality of course evaluations in education compared to the common standard of web surveys. Past research indicates that web surveys come with disadvantages, such as poor response quality caused by inattention, survey fatigue or satisficing behavior. To test if conversational ...
Preprint
An Overview of Modeling Concepts for Service-Based Software Architectures
(2020)
This document provides an overview of modeling concepts for service-based software architectures (SBSAs). The concepts were extracted during a survey of conceptual frameworks for architecture modeling of SBSAs.
Konferenzveröffentlichung
Unleashing the Potential of Conversational Agents for Course Evaluations: Empirical Insights from a Comparison with Web Surveys
(Association for Information Systems, 2020)
Recent advances in Natural Language Processing (NLP) bear the opportunity to design new forms of human-computer interaction with conversational interfaces. However, little is known about how these interfaces change the way users respond in online course evaluations. We aim to explore the effects of conversational agents (CAs) on the response quality of online course evaluations in education compared to the common standard of web surveys. Past research indicates that web surveys come with disadvantages, such as poor ...
Dissertation
Planning of Autonomous and Mobile Robots in Dynamic Environments
(2018-11)
The capabilities of autonomous robots are increasing which is a reason for research progress
in the last years. An increasing number of robotic scenarios are becoming more viable in
various domains for example, mowing, harvesting, warehouse robots. But autonomous
mobile robots need more than the ability to navigate through their world, and manipulate
objects. Even in teams of robots, a structured plan for each team member is necessary.
Planning becomes a more important task. Furthermore, the environment can ...
Dissertation
Fehlertoleranz und Elastizität für ein Framework zur globalen Lastenbalancierung
(2018-09-10)
Die Anzahl an Rechenknoten in Hochleistungsrechnern wächst stetig. In solchen Systemen nimmt die Bedeutung von Fehlertoleranz zu, da die Wahrscheinlichkeit eines permanenten Knotenausfalls ebenfalls stetig wächst.
Fehlertoleranz gegenüber permanenten Knotenausfällen wird typischerweise durch Checkpointing auf Systemebene realisiert. Findet das Checkpointing jedoch auf Anwendungsebene statt, können Laufzeitvorteile erzielt werden. Diese Implementierungen sind allerdings zeitintensiv und fehleranfällig. Anwendungen, ...